diff options
author | Jeff Garzik <jgarzik@pretzel.yyz.us> | 2005-06-26 23:42:30 -0400 |
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committer | Jeff Garzik <jgarzik@pobox.com> | 2005-06-26 23:42:30 -0400 |
commit | f45727d52d1581e9ff4df9d1a12a60789ad2d1eb (patch) | |
tree | 773ae25f98542e6d382c688f7e85e8137d065614 /arch/xtensa/kernel/pci-dma.c | |
parent | 4c925f452cfd16c690209e96821ee094e09a2404 (diff) | |
parent | 5696c1944a33b4434a9a1ebb6383b906afd43a10 (diff) |
Merge /spare/repo/netdev-2.6/ branch 'ieee80211'
Diffstat (limited to 'arch/xtensa/kernel/pci-dma.c')
-rw-r--r-- | arch/xtensa/kernel/pci-dma.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c new file mode 100644 index 00000000000..84fde258cf8 --- /dev/null +++ b/arch/xtensa/kernel/pci-dma.c @@ -0,0 +1,73 @@ +/* + * arch/xtensa/pci-dma.c + * + * DMA coherent memory allocation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * Copyright (C) 2002 - 2005 Tensilica Inc. + * + * Based on version for i386. + * + * Chris Zankel <chris@zankel.net> + * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> + */ + +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/pci.h> +#include <asm/io.h> +#include <asm/cacheflush.h> + +/* + * Note: We assume that the full memory space is always mapped to 'kseg' + * Otherwise we have to use page attributes (not implemented). + */ + +void * +dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, int gfp) +{ + void *ret; + + /* ignore region speicifiers */ + gfp &= ~(__GFP_DMA | __GFP_HIGHMEM); + + if (dev == NULL || (*dev->dma_mask < 0xffffffff)) + gfp |= GFP_DMA; + ret = (void *)__get_free_pages(gfp, get_order(size)); + + if (ret != NULL) { + memset(ret, 0, size); + *handle = virt_to_bus(ret); + } + return (void*) BYPASS_ADDR((unsigned long)ret); +} + +void dma_free_coherent(struct device *hwdev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + free_pages(CACHED_ADDR((unsigned long)vaddr), get_order(size)); +} + + +void consistent_sync(void *vaddr, size_t size, int direction) +{ + switch (direction) { + case PCI_DMA_NONE: + BUG(); + case PCI_DMA_FROMDEVICE: /* invalidate only */ + __invalidate_dcache_range((unsigned long)vaddr, + (unsigned long)size); + break; + + case PCI_DMA_TODEVICE: /* writeback only */ + case PCI_DMA_BIDIRECTIONAL: /* writeback and invalidate */ + __flush_invalidate_dcache_range((unsigned long)vaddr, + (unsigned long)size); + break; + } +} |